======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '131'
                                          'artist'  'Len Spencer'
                                     'text_people'  ''
                                         'release'  'Edison'
                                           'title'  'First Recorded Promotional Message 1899'
                                           'quals'  ("['Q-HAP-2', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-1', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['1900s', 'old fashioned', 'all', 'oldies', 'acoustic era']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1899'
                                        'comments'  ''
                                           'genre'  'prerock-nonmusic'
                                             'bpm'  '85.9'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

======================== rawer (from filesystem) ========================

'TALB' (Album/Movie/Show title)                     'Edison'
'TBPM' (BPM (beats per minute))                     '85.9'
'TCON' (Content type, a.k.a. Genre)                 'prerock-nonmusic'
'TDRC' (Recording time)                             '1899'
'TIT2' (Title/songname/content description)         'First Recorded Promotional Message 1899'
'TKEY' (Initial key)                                '9A'
'TLEN' (Length)                                     '131000'
'TPE1' (Lead performer(s)/Soloist(s))               'Len Spencer'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['1900s', 'old fashioned', 'all', 'oldies', 'acoustic era']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.40 dB'
'TXXX:replaygain_track_peak'                        '0.500519'

========================== row from database ==========================
                                              'id'  513920
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1899 - Len Spencer - first promotional record [speech].mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  131
                                           'genre'  prerock-nonmusic
                                        'filesize'  2629966
                                           'mtime'  1674646636
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] first promotional record [speech] prerock nonmusic
                                      'tag_artist'  Len Spencer
                                     'tag_release'  Edison
                                       'tag_title'  First Recorded Promotional Message 1899
                                             'bpm'  85.9
                                    'search_title'  '1899':5 'first':1 'message':4 'promotional':3 'recorded':2
                                   'search_artist'  'len':1 'spencer':2
                                  'search_release'  'edison':1
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'first':20 'nonmusic':26 'old':7 'prerock':25 'promotional':21 'record':22 'recordings':8,9,10 'speech':23,24 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':19 '1899':5A '1920':20 '32k':22,24,26 'cylinder':10,12 'cylindervery':14 'edison':8C 'first':1A,28 'len':6B 'message':4A 'nonmusic':34 'old':15 'prerock':33 'promotional':3A,29 'record':30 'recorded':2A 'recordings':16,17,18 'speech':31,32 'spencer':7B 'very':11,13 'wax':9 'wma':21,23,25 'wma32k':27
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HAP-2', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', 'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', 'q-play-2', 'q-chart-2', 'q-drums-1', 'q-other-1', 'q-piano-1', 'q-vocals-4', 'q-mixbeat-1']
                                      'lastfmtags'  ['1900s', 'old fashioned', 'all', 'oldies', 'acoustic era']
                                        'tag_date'  1899
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1674646636.3457975  (2023-01-25 12:37:16)
                             'size'  2629966